Tweak speed of Matrix effect

src/app_matrix.rs

@@ -50,9 +50,9 @@ impl MatrixColumn {
     fn update(&mut self, height: u16, frame_counter: usize, speed_multiplier: usize) {
         // Calculate effective speed with multiplier (higher multiplier = faster)
         let effective_speed = if speed_multiplier == 0 {
-            self.speed as usize * 4 // Much slower when multiplier is 0
+            self.speed as usize * 8 // Much slower when multiplier is 0
         } else {
-            (self.speed as usize * 2).saturating_sub(speed_multiplier.saturating_sub(1)).max(1)
+            (self.speed as usize * 4).saturating_sub(speed_multiplier.saturating_sub(1)).max(1)
         };
 
         if frame_counter % effective_speed == 0 {